The members of ______ are required not only to harmonize their taxation, government expenditure, industry policies，etc.，but also use the same currency.
A、Mercosur
B、the Customs Union
C、the common market
D、the economic union
【正确答案】：D
【题目解析】：The members of an Economic Union are required not only to harmonize their taxation, government expenditure, industry policies，etc.，but also use the same currency.参见教材P36。